US Constitution Series, Article IV, Section 2
Article IV. STATES' RELATIONSThis section prevents states fro discriminating against citizens of another state. It also provides for extradition for criminals, including escaped convicts. To the extent the final paragraph referred to slavery, it was rendered inoperative by the Thirteenth Amendment.
§ 2. Interstate Comity
The Citizens of each State shall be entitled to all Privileges and Immunities of Citizens in the several States.
A Person charged in any State with Treason, Felony, or other Crime, who shall flee from Justice, and be found in another State, shall on Demand of the executive Authority of the State from which he fled, be delivered up, to be removed to the State having Jurisdiction of the Crime.
No Person held to Service or Labour in one State, under the Laws thereof, escaping into another, shall, in Consequence of any Law or Regulation therein, be discharged from such Service or Labour, but shall be delivered up on Claim of the Party to whom such Service or Labour may be due.